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 <?php
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Filter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Filter_Interface
  */
 // require_once 'Zend/Filter/Interface.php';
 
 /**
  * @category   Zend
  * @package    Zend_Filter
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Filter_PregReplace implements Zend_Filter_Interface
 {
     /**
      * Pattern to match
      * @var mixed
      */
     protected $_matchPattern = null;
 
     /**
      * Replacement pattern
      * @var mixed
      */
     protected $_replacement = '';
 
     /**
      * Is unicode enabled?
      *
      * @var bool
      */
     static protected $_unicodeSupportEnabled = null;
 
     /**
      * Is Unicode Support Enabled Utility function
      *
      * @return bool
      */
     static public function isUnicodeSupportEnabled()
     {
         if (self::$_unicodeSupportEnabled === null) {
             self::_determineUnicodeSupport();
         }
 
         return self::$_unicodeSupportEnabled;
     }
 
     /**
      * Method to cache the regex needed to determine if unicode support is available
      *
      * @return bool
      */
     static protected function _determineUnicodeSupport()
     {
         self::$_unicodeSupportEnabled = (@preg_match('/\pL/u', 'a')) ? true : false;
     }
 
     /**
      * Constructor
      * Supported options are
      *     'match'   => matching pattern
      *     'replace' => replace with this
      *
      * @param  string|array $options
      * @return void
      */
     public function __construct($options = null)
     {
         if ($options instanceof Zend_Config) {
             $options = $options->toArray();
         } else if (!is_array($options)) {
             $options = func_get_args();
             $temp    = array();
             if (!empty($options)) {
                 $temp['match'] = array_shift($options);
             }
 
             if (!empty($options)) {
                 $temp['replace'] = array_shift($options);
             }
 
             $options = $temp;
         }
 
         if (array_key_exists('match', $options)) {
             $this->setMatchPattern($options['match']);
         }
 
         if (array_key_exists('replace', $options)) {
             $this->setReplacement($options['replace']);
         }
     }
 
     /**
      * Set the match pattern for the regex being called within filter()
      *
      * @param mixed $match - same as the first argument of preg_replace
      * @return Zend_Filter_PregReplace
      */
     public function setMatchPattern($match)
     {
         $this->_matchPattern = $match;
         return $this;
     }
 
     /**
      * Get currently set match pattern
      *
      * @return string
      */
     public function getMatchPattern()
     {
         return $this->_matchPattern;
     }
 
     /**
      * Set the Replacement pattern/string for the preg_replace called in filter
      *
      * @param mixed $replacement - same as the second argument of preg_replace
      * @return Zend_Filter_PregReplace
      */
     public function setReplacement($replacement)
     {
         $this->_replacement = $replacement;
         return $this;
     }
 
     /**
      * Get currently set replacement value
      *
      * @return string
      */
     public function getReplacement()
     {
         return $this->_replacement;
     }
 
     /**
      * Perform regexp replacement as filter
      *
      * @param  string $value
      * @return string
      */
     public function filter($value)
     {
         if ($this->_matchPattern == null) {
             // require_once 'Zend/Filter/Exception.php';
             throw new Zend_Filter_Exception(get_class($this) . ' does not have a valid MatchPattern set.');
         }
 
         return preg_replace($this->_matchPattern, $this->_replacement, $value);
     }
 
 }